Water has zero respect for minimalist detailing once mountain topography gets involved. Heartbreaking about the fresh larch, but a harsh reminder of why traditional sills earned their clunky step.

Old timber traditions put the sill plate on a proper plinth for a reason—the second you get wind-driven mountain rain, surface tension breaks and water just skates right over those hidden linear grates. Gravity-fed drainage specs never account for horizontal gusts pushing runoff across the threshold.

Really appreciate the honesty here—hidden linear gully flow ratings always seem to assume gentle sheet flow, never the actual velocity of mountain run-off hitting a zero-step threshold. Heartbreaking about that fresh larch floor.

Did the linear gullies just get overwhelmed by the volume of run-off, or was wind pressure driving the sheet flow straight across the slot? Really hoping the larch didn't cup too badly before you could dry it out.

Section drawings are always so confident about surface tension until driving rain hits that hidden slot head-on. Saw the exact same heartbreak on a spotted gum floor down near the Otways when a concealed trench gave up ten minutes into a coastal storm.